Number of ways of arranging the numbers 1 ... 3n into a 3 X n array so there is exactly one local maximum.

A087924

Number of ways of arranging the numbers 1 ... 3n into a 3 X n array so there is exactly one local maximum.

Terms

    a(0) =4a(1) =208a(2) =29568a(3) =7452704a(4) =2941306368

External references